3 x 18650 Battery Holder with DC2.1 Power Jack

The 18650 lithium battery is a commonly used lithium battery in electronic products. It is often used in batteries of laptop computers and power banks. 18650, which refers to a battery with a diameter of 18mm and a length of 65mm.

This 3 x 18650 battery holder has inner connection in series, DC 2.1 power jack, standard 11.1V output. You can connect Arduino directly.